But what seems clear is that experiments to falsify the equivalence principle are going to be complicated.

FORBES: Physicists Seek A Divorce: Prying Gravity ... From Inertia

One way is to try and falsify the equivalence principle, to show that the two phenomena of gravitational and inertial mass are not really identical.

FORBES: Physicists Seek A Divorce: Prying Gravity ... From Inertia